Climate
New Haven weather by month
Average highs, lows, rain and snow for every month, from 30 years of weather records.
Average temperatures
- Jan
- Feb
- Mar
- Apr
- May
- Jun
- Jul
- Aug
- Sep
- Oct
- Nov
- Dec
Best time to visit: May, June, July, when highs are mild and rain is lightest.
Month by month
| Month | High | Low | Rain | Wet days |
|---|---|---|---|---|
| January | 38°F | 23°F | 2.7 in | 10 |
| February | 40°F | 24°F | 2.8 in | 9 |
| March | 47°F | 30°F | 3.7 in | 10 |
| April | 58°F | 39°F | 4.2 in | 11 |
| May | 68°F | 49°F | 3.5 in | 13 |
| June | 76°F | 59°F | 3.5 in | 12 |
| July | 82°F | 66°F | 3.4 in | 10 |
| August | 81°F | 65°F | 3.5 in | 10 |
| September | 75°F | 57°F | 4.0 in | 9 |
| October | 64°F | 46°F | 3.8 in | 11 |
| November | 53°F | 36°F | 3.1 in | 9 |
| December | 44°F | 29°F | 3.5 in | 11 |
NOAA U.S. Climate Normals 1991–2020, New Haven Tweed Ap, Ct Us (3.8 mi away, 3 ft). Wet days: days with at least 0.01 in of precipitation.
Questions
What is the hottest month in New Haven?
July, with an average high of 82°F and low of 66°F.
What is the coldest month in New Haven?
January, with an average low of 23°F and high of 38°F.
When does it rain most in New Haven?
April is the wettest month, averaging 4.2 in of precipitation; the year totals about 41.7 inches.
What is the best time to visit New Haven?
For mild weather (highs between 65°F and 85°F) with the least rain, May, June, July.
Where do these numbers come from?
NOAA’s 1991–2020 U.S. Climate Normals for the New Haven Tweed Ap weather station, 3.8 miles from downtown: 30-year averages, not a forecast.